1. ` A) Some chemical substances can function as hormones or be integrated with the central and peripheral nervous systems. B) Hormones directly initiate many of the processes that contribute to hom... eostasis. C) Control of body processes is ensured by the fact that a single hormone can only exert one effect on one specific system or tissue. D) Each hormone that exists in the body is produced by only one specific endocrine gland. Ans: A Feedback: Some chemicals, such as epinephrine, can both function as a hormone and be closely integrated with the central and peripheral nervous systems as well as the immune systems, leading to current terminology such as “neuroendocrine.” Hormones modulate, but do not initiate, changes in the body, and one hormone may exert multiple effects on multiple body systems. Hormones are produced by a variety of body tissues, not solely by endocrine glands. 2. An example of a single hormone that can exert effects in different tissues, erythropoietin, made in the kidney stimulates the bone marrow to produce A) platelets. B) natural killer cells. C) red blood cells. D) mast cells. Ans: C Feedback: A characteristic of hormones is that a single hormone can exert various effects in different tissues. For example, erythropoietin, a traditional circulating hormone, is made in the kidney and stimulates erythropoiesis in the bone marrow. 3. A nurse who works in the office of an endocrinologist is orienting a new staff member. Which of the following teaching points is the nurse justified in including in the orientation? Select all that apply. A) “A bodily process can be the result of the combined effect of several different hormones from different sources.” B) “A single hormone can act not only on one process or organ but often on several different locations or processes.” C) “It's common for production of hormones to be far removed from the tissue where they ultimately exert their effect.” D) “Sometimes hormones act locally on the area where they were produced, like in the case of paracrine and autocrine actions.” E) “The regulation in homeostasis requires that hormones be absent from the body when their effect is not needed.” Ans: A, B, C, D Feedback: A single hormone can exert various effects in different tissues or, conversely, a single function can be regulated by several different hormones. Hormones act both distant from their source and more locally, as in the case of autocrine and paracrine actions. Hormones are normally present at all times. 4. When explaining about structural classifications to a group of students, the instructor discusses the peptides and proteins. They talk about small hormones and hormones as large and complex as growth hormone (GH), which has approximately how many amino acids involved? A) 50 amino acids B) 100 amino acids C) 150 amino acids [Show More]
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